iframe的替代文字 [英] Alternate text for iframes

问题描述

对于HTML中的 img 标记，我们有替代文本 alt 属性，这些标记会在图像不出来。我试着用 iframe 这个标签。

We have alternate text, alt attribute, for an img tag in HTML, which will show up when the image doesn't come up. I tried using the tag with iframe too.

<iframe src="www.abc.com" alt="Web site is not avaialable">

但是当 src =给出。如果没有给出 src ？

But the alternate text doesn't come up when src="" is given. Just wanted to know if I can achieve alternate text in any other way, if the src is not given ?

推荐答案

由于我第一次尝试误解了你的问题，我们来试试这个：

Since my first attempt misunderstood your question, let's try this instead:

<script>
$(function () {

    $("iframe").not(":has([src])").each(function () {

    var ifrm = this;

    ifrm = (ifrm.contentWindow) ? ifrm.contentWindow : (ifrm.contentDocument.document) ? ifrm.contentDocument.document : ifrm.contentDocument;

    ifrm.document.open();
    ifrm.document.write($(this).attr("alt"));
    ifrm.document.close();

    });

});
</script>

这将读取任何iframe的alt标签值，不带任何src属性或src属性与一个空白值，并将alt文本写入该iframe的主体。

This will read the "alt" tag value for any iframe with either no src attribute or a src attribute with a blank value, and write the alt text into the body of that iframe.

来自使用Javascript或jQuery将元素写入子iframe

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